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Potential for bleeding with the new beta-lactam antibiotics.

F R Sattler, M R Weitekamp, J O Ballard

Annals of Internal Medicine

|December 1, 1986

Summary

Certain beta-lactam antibiotics can disrupt blood clotting. Cephalosporins with methylthiotetrazole may cause hypoprothrombinemia, while others with alpha-carboxyl groups can impair platelet function, increasing bleeding risk.

Area of Science:

Pharmacology
Hematology
Internal Medicine

Background:

Beta-lactam antibiotics are widely used, but some can interfere with hemostasis.
Specific structural features of beta-lactams are associated with distinct hemostatic defects.

Purpose of the Study:

To review the hemostatic complications associated with various beta-lactam antibiotics.
To identify the specific antibiotic structures linked to hypoprothrombinemia and impaired platelet function.

Main Methods:

Literature review of clinical studies and case reports on beta-lactam antibiotic-induced hemostatic abnormalities.
Analysis of antibiotic structures and their correlation with observed bleeding risks.

Main Results:

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Cephalosporins with methylthiotetrazole substitution (e.g., cefamandole, moxalactam) frequently cause hypoprothrombinemia (4-68% incidence), especially in high-risk patients.

Beta-lactams with alpha-carboxyl substitution (e.g., moxalactam, carbenicillin) impair platelet function, prolonging bleeding time.

Acylureidopenicillins show less frequent and milder platelet dysfunction.

Conclusions:

Hypoprothrombinemia from methylthiotetrazole-containing cephalosporins requires fresh frozen plasma for treatment.
Platelet dysfunction necessitates platelet concentrate transfusions to manage serious hemorrhage.